Dustless rock drill



Aug. 3 1926. 1,594,922 L. c. BAYLESET AL nus'rmsss ROCK mum.

Filed Feb. 28, v1924 2 Sl'1eetsShee\. 1

led

a m 12%? was THE"? ATTOR Y Patented Aug, 3, 1925.

UNITED smrss rarnur ()FFICE.

LEWIS c. BAYLES AND CHARLES c, HANSEN, or nAs'roN, P ENNsYL'vANIA, AssIe-No'rt's To INGERSOLL-RAND COMPANY, OF JERsEY CITY, NEW

OF NEW JERSEY.

nUs'rrLEss ROCK DRILL.

Application filed February 28, 1924. Serial No. 695,622

This invention relates to fluid actuated rock drills particularly of the hammer type, provided with a hammer piston having a head and a forward fluted shank reciprocat ing in a cylinder, for imparting blows of impact to a hollow drill steel through which cleansing fluid, as is supplied to the drilled hole.

In those cases in which objectionable fog- 1 ging and dust might be created by the'intermingling of the air and water for cleansing the hole, provision may be made for preventing air from passing along the flutes of the piston shank to the front head cavity and thus mingling with the water.

The object of the present invention is to prevent air from passing along the flutes,

of the piston shank by means of a sealing member or members which form part of the front cylinder washer and do not require reconstruction of a standard rock drill for the insertion of the new parts. I

The seal of the piston flutes may be a metal to metal seal between the flutes and a metal sealing member and in some instances an additional packing or cup leather is provided. In carrying out the invention, the front cylinder washer comprises a plurality of metal parts through which the Y0 piston shank passes, the main part of the washer preferably being stationary in the front end of the cylinder, and another auxiliary part of the washer forming a sealing member fluted to correspond with the piston shank and adapted to rotate with the piston relatively to the stationary part. The rotating part of the washer may be transversely dividedand the additional packing member may be located between the said divided parts.

One of the advantages of this construction resides in the fact that the dust preventing devices may be readily applied to standard drills of the Leyner type using a so called short piston, without changing the piston,

The invention is shown in its preferred,

form in the accompanying drawings, in which- Figure 1 is 'a longitudinal sectional elevation of a rock drill of the type known as the Leyner.

Figure '2 is a detail longitudinal sectional view of one part of the front cylinder washer,

water or air and water,

the cylinder and is provided witha forward theblows of the ,piston.

Vmately fits a hole in Figure 3 is a detail perspective view of another part of thewasher,

Figure 4: is an enlarged detail longitudinal sectional view of another form of the rotatable part of the washer,

Figure 5 is a detail perspective view of the fibrous packing or cup leather for the washer,

Figure 6 is an enlarged detail longitudinal sectional view of a modified form of the rotatable part of the washer,

Figure 7 isa form of packing latter bore may be formed by the front cylinder washer having the main stationary part or member D and the auxiliary part B, the latter being rotatable relatively to the main part D for the purposes hereinafter more fully described.

A piston E is adapted to reciprocate in extension F fitting the bore C of smaller diameter. A hollow drill steel G is carried in the usual manner by the forward end of the machine, and extends intojthe machine to a position to receive the impact of A water tube H extends longitudinally through and approxithe piston, and is adapted to deliver water to the drill steel,

Motive fluid is supplied 'to the machine JERSEY, A CORPORATION I perspective View of another portion of a rock drill equipped r forward bore C of smaller diameter, which through the inlet J controlled by a suitable V throttle of which the controlling handle 'K only is indicated. A suitable fluid distributing valve may be provided in the valve chest L, but as the distribution of motive fluid to the cylinder forms no part of the present invention, the details of'such construction are not indicated. The piston is provided with a rifle nutO cooperating with the rifle bar P and the usual back head is Y provided packing which may be in piston shank o is preferably 7 and 10 the rotatable part cylinder (0 and p ano indicated at Q, having the water connection R. The parts of the machine areheld together by the usual side bolts S, a portion of one side bolt being shown.

' Any suitable and usual front head con struction for the machine may be provided, and in this instance the front head T is with the front head cap U in which is located the chuck key V. I A chuck nut/W, is threaded to the chuck X and within the chuck are located the chuck front bushing, Y and the chuck backbushing Z. c

So far described, the machine is like a standard Leyner drill, except that the flutes on the piston shank F are shown extending substantially the entire length of the shank although theyneed only extend for a portion of the shank leavingthe re mainder of the shank smooth as usual. The piston is of the ordinar standard length.

In accordance with our invention, the front cylinder washer D in'Figure 1 is provided with the rotatable auxiliary part or member D" formed with theflutes to conform to the flutes a of the piston shank. The fluted rotatable member D preferably forms a substantially close fit with the flutes aof the piston shank, so that there is a metal to metal seal between these parts which prevents air in any appreciable quantity from passing along the flutes to the cavity of the fronthead. In order any air which may D and the front cylinder washer D to pass to atmosphere, the member D is preferably provided with an annular external groove 6 and the stationary front cylinder washer member D and the drill cylinder are provided with apertures (Z and e respectively, communicating with the groove 0 and forming vents. To further provide for leakage, a vent from the chuck cavity permits any air which would otherwise pass to the drill steel, to be vented to atmosphere 7 In the modification of the invention shown in Figures l, 5 andv 9, the rotatable part D? which may be inserted infithe front cylinder washer D to rotate with the piston, is divided. into two parts 7 and h, and the fibrous L theform of'a cup leather j, is located between the two parts 7 and it and is constructed to conform to the to p erm 1t flutes of the piston shank, as illustrated par- 7 ticularly in Figure 5, so that the packing or cup. leather extends rearwardly along the and forms an additional seal of the piston-shank. The part under-cut at has shown to accommodate thecnp leather j.

:In the modification for the flutes shown in Figures-6, D of the front washer'is alsodivided into sections l the packing or cup,

the sections 0 and 3,9.

located between In this leak between the m ember :inder and the leather 9 case the cup leather g is pressed or otherwise formed so that the corrugations or flutes a" of the cup leather embrace and eX- tend along the flutes of the piston shank an appreciable distance.

In the modification sho vn in Figure 8, the rotatable part D of the front cylinder washer is not divided, but one end is under cut at s to accommodate the cup leather 7' like that shown in Figure 5.

li e claim: Y

1,,The combination of a fluid actuated rock drill having a cylinder, a reciprocating piston having ahead and a forward fluted shank, front cylinderwasher having parts adapted to be inser-tedin the washer to rotate therein, said parts being fluted to cooperate with the flutes on the piston shank,

and a fibrous packing between the said parts der having two parts adapted to be inserted in the washer to rotate therein, saidparts being tluted to cooperate with the flutes on the piston shank, a fibrous packing held between inc. parts and formed to cooperate with tl e flutes of the shank for preventing lei of motive fluid along the piston i'lul to a drill steel and rotatable with said shank, an annular external groove on said parts, and passages "leadingfrom said atmosphere to conduct motive fluid leaking between the piston shank and the front cylinder washer to tlieatmosphere.

Thecon'ibinaticn of a fluid actuated rock drill having a. cylinder, a reciprocating piston having a head and a forwardfluted shank, front cylinder washer encircled by the cylinder having two par-ts adapted to rotate in the washer, said parts having flutes fro-cooperate with the flutes on the piston shank, a cup leather held'between said parts and having a rearwardly extending portion constructed to conform to the flutes on he piston shank for preventing leakage ofrnotive fluid along the piston flutes't-o a drill steel, said cup leather being rotatable with said shank, an external annular groove on said parts to receive motive fluid leaking begroove to the tween the piston shank and the front cylinder washer, and passages through the cylfront cylinder washer coinmunicatingwith said groove to permit the escape of leakage motive fluid from the groove to the atmosphere.

' 7 In testimony whereof we have signed this specification. a A CHARLES C. HANSEN.

C. BAYLES. 

